Do You Need a Continuous Glucose Monitor? A Physician's Honest Assessment

In 2024, the FDA cleared the first over-the-counter continuous glucose monitors (CGMs) for use without a prescription. The Dexcom Stelo and Abbott Lingo launched to significant interest — not from diabetics, but from health-conscious people curious about how food, exercise, sleep, and stress affect their blood sugar in real time.

This raises a clinically interesting question: does real-time glucose data provide actionable health benefit for people without diabetes? The honest answer is nuanced.

What a CGM Actually Measures

A CGM uses a tiny sensor inserted just under the skin (typically the upper arm or abdomen) to measure interstitial fluid glucose every 1–5 minutes, transmitting data to a smartphone app. It's not quite the same as blood glucose — there's a 5–15 minute lag — but it gives you a continuous trend rather than a single point-in-time snapshot.

For people with Type 1 or insulin-dependent Type 2 diabetes, CGMs are transformative — they enable precise insulin dosing decisions, catch dangerous lows before they become emergencies, and dramatically improve glycemic control. The evidence base here is overwhelming.

For people without diabetes, the picture is different.

The Case For Non-Diabetic CGM Use

There are legitimate reasons a physician might recommend CGM use in someone without diabetes:

• Pre-diabetes evaluation: A fasting glucose and HbA1c give snapshots; CGM reveals post-meal spikes that may be clinically significant even when fasting values are normal. Some people with "normal" HbA1c have post-prandial excursions above 180 mg/dL.
• Behavioral feedback: Seeing exactly how a bowl of white rice spikes your glucose, versus brown rice or cauliflower rice, is powerfully motivating for some patients. Data personalized to your biology beats generic dietary advice.
• Exercise optimization: Athletes and high-performance individuals use CGM to time carbohydrate intake around training and competition. This is well-established in sports medicine.
• Metabolic syndrome risk: People with central obesity, hypertension, or a family history of T2DM have elevated risk. Early glucose pattern data may prompt earlier dietary or lifestyle intervention.

The Honest Caveats

Here's where I need to be direct with you, because the wellness industry won't be:

Normal glucose variability is not inherently dangerous. Post-meal glucose spikes into the 130–150 mg/dL range in healthy people are physiologically normal. CGM data without proper context can generate unnecessary anxiety about normal physiology. I've seen patients panic over readings that, clinically, are entirely unremarkable.

The evidence for outcomes improvement in non-diabetics is limited. As of 2026, we have very good data showing CGM improves outcomes in diabetes. We do not have equivalent randomized controlled trial data showing non-diabetic CGM use reduces cardiovascular disease, diabetes incidence, or mortality. The mechanism is plausible; the outcome data is not yet there.

Cost-effectiveness is unproven in the general population. OTC CGM sensors run $50–$100 for a 15-day sensor. At $100–$200/month for continuous use, that's real money for a benefit that, outside diabetes management, is predominantly behavioral.

Who I Would (and Wouldn't) Recommend CGM For

Consider it if you:

• Have pre-diabetes (HbA1c 5.7–6.4%) and want to understand your glucose patterns
• Have a family history of T2DM and central obesity
• Are an athlete wanting to optimize carbohydrate timing
• Have tried and failed to understand how diet affects your energy levels

Probably don't need it if you:

• Have a normal BMI, normal HbA1c, no family history, and healthy lifestyle habits
• Are anxiety-prone — CGM data can trigger health anxiety in some people
• Don't have a clinical framework for interpreting the data (just watching a number without guidance is limited value)

What to Do Instead (or First)

Before spending $100–$200/month on a CGM, consider these high-value, evidence-based metabolic health interventions that cost far less:

• Get a fasting glucose, HbA1c, and fasting insulin measured — a $30–$50 lab draw tells you more diagnostically than a month of CGM data
• Add a 10-minute walk after your largest meal — proven to blunt post-prandial glucose spikes
• Eat protein and vegetables before carbohydrates in a meal — demonstrated to reduce post-meal glucose excursions by 20–40%
• Reduce ultra-processed carbohydrates — this single change has the largest single-variable impact on glucose variability

My Recommendation

CGMs are a valuable tool in the right context. For most healthy adults, a 15-day trial CGM — used once, with a physician or dietitian to help interpret the data — is a reasonable health investment that can meaningfully personalize dietary guidance. Indefinite continuous use without a clinical indication is harder to justify at current costs.

If you have pre-diabetes, are managing metabolic syndrome, or have a strong family history of T2DM, the conversation with your physician about regular CGM use is absolutely worth having.